Telephone set



W. T. BOOTH.

TELEPHONE SET.

APPLICATION man JUNE 30, ISHI.

Pawnted May 25, 1920.

Fig.

UNITED. STATES PATENT OFFICE.

WILLIAM T. BOOTH, OF EAST ORANGE; NEW JERSEY, ASSIGNOR TO WESTERN ELECTRIC COMPANY, INCORPORATED, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

TELEPHONE SET.

Application filed .vuue 30,

I h (1.66 whom it may concern Be it known thatl, W 11.1.1.1 M 'l. Boo'rI-I, a citizen of the United States, residing at l'last ()rai'ige, in the county of Essex and is provided with a horn and. the two mount ed so as to extend over and partially sur round the transmitter.

Another object is to provide a -\\'all set 01 ither flush or noirflush type having the receiver arranged within the set in 'such a way as to pr'ovide surh a compact arrangeineni of parts that the outlet box or casing for use therewith is no larger than those required for similar sets'having the receiven carried exterior-1y. To accomplish this, the receiver is arranged horizontallv at the rear of the set and the horn thereof is extended riu'tirally therefrom and bent at its outer end to direct the sound cxteriorly of the set.

A further obj-cot is to provide a set which may be secured to its front plate or casing as a single unit, and to accomplish this result all the necessary parts of the set, including the receiver and transmitter, are secured jon a single mounting plate and this late secured to the front plate or casing wit which it is to be used.

In the drawing Figure 1 is a. vertical cross section of a flush type vestibule set, taken. on the line 1--1 of Fi 2, and having the outlet box thereof on y partially shown; Fig. 2 is a rear elevation of the set with the outlet box removed; and Fig. 3 is a front elevation thereof on a much smaller scale.

The particular set shown is. of thoflush type and has a front plate 10 of any suitable material. preferably me :11 this plate being of any desired finish. The plate 1Q carries a mouthpiece 11 which preferably is either integral therewith or secured thereto in such a way that it is necessary to have access to the rear of the plate before the mouthpiece can be removed. Openings 12 are provided Specie ution of Letters Patent. Patented Mtay 25, 1920.

1917. Serial No. 1%,957.

in. the plate 1.0 above the mouthpiece l1, and an L-shapcd horn .13 is located at the rear of the plate and secured to a horizontally arranged receiver 1-1 to direct the sound therefrom exteriorly of the set; By placing he receirer at the rear of the plate it is not iable to be stolen or tampered with, as is the case where it is located in front thereof. A screen 15 is provided between the plate 10 1nd the outer end of the horn 13 to cover the openings 12 and to prevent the entrance of foreign matter into the horn 13 and resulting interference \viththe adjustment of the receiver. The screen 15 is preferably secured directly to the mouth of the horn and carried therewith, but may be secured to the rear of the plate 10 covering the openings 12, if desired. Another opening 16 is provided in the plate 10 below the mouthpiece 11, and a finger key 17 extends therethri-iugh and is pivoted to a bracket 18 carried on a mounting plate 19 which also has an open ing through which the key 17 extends. If

desired, the portion of the key 17 at the front of the plate 111 may be made sufficiently small to pass through the opening 16 of the front plate 10, thus permitting it to be assembled relative to the front plate Without disengagement from its bracket 18. The mounting plate 19 carries all the working parts of the set and is so constructed that all the parts can be arranged thereon and this plate secui'bd as a. unit to any one of the number of different front plates, or changed from one front plate to another at any time without mutilation of any of the internal wirin or removal of any of the working parts mm the mounting plate.

The receiver 14 is mounted horizontally; an L-shaped lug 20 carried by eceiver cap 21 serving to secure the i eriver to the mounting plate 19. The reieiver casing proper 22 is threaded in this stationar cap 21 and so spaced that it may be readi y removed. for inspection or adjustment Without disturbing other up aratus or, interfering with the horn 13, w ich is carried by the cap 21. The horizontal arrangement of the receiver 14; and the use of an L-shap d born, 13 arranged vertically of the set adEitS of the apparatus thereof being positions in an outlet box 23, no larger than those used where the receiver is manged at. the front of the plate 10. This further admits of using a non-flush wall casing of no greater Bil used where the receiver is in case a noirllush type than the Hush depth than those carried exteriorly, oi wall set is desired, rather type shown in the drawin s.

The horn 13 is removal) y secured to the receiver cap 21 at one end and is provided with an extension 24 on the lower part oi the. horn at. the other end. The loner rdge ol this part of the horn 115 extends just. above the upper end of the mounting); plate it), which admits ol' the extension 2i c, ;teui|iu; in front of the upper portion oi the mount ing;- plate 19 and provider. tor the engagement of the extension it between the trout plate 1!) and mounting; plate it) on securing the. two plates together. This serves to hold the horn more firmly in position than would be possible by depending only on the engagement oi the lower end of the horn with the receiver cap 21. A

transmitter 25 is mounted in a suitable opening in the plate ll) opposite to the mouthpiece it and is (lunged to engage an annular in. --ul:itin;; washe til llll'illlgttl at the rear of and adjacen to the opening in the .nrounting plate Ill, the opening in the washer 43'; being: slightly l ss than that in the plate and engaging the side wall of the transmitter 25 to hold it out ol' contact with the plate It). Spring clips 21' serve to hold the transmitter firnily in place and are preterably carried on insulatin;, strips 27 se cured to the plate 19. The transmitter and the receiver with its horn are relatively positioned so that the horn extends to the rear of and above the transn'iitter, while the receiver cap extends below the transmitter. This serves to house he transmitter to a great extent and to protect it against injury, especially utter assembly of the apparni '1 on the mounting plate to Form a unitary ucture. but before. the attachment of a fire t plate thereto. It, also provides protectiim after attaclnnent oi the front plate but bei'ore installation of the set has been complete L. as well as providing a compact structure capable of being used with outlet boxes as small as those heretofore used with flush sets having the receiver located exteriorly. The bracket 18 and the finger key 17 are secured to therear of the mounting plate 19 and carry two springs 28 and 29 insulated from each other and normally disengaged. at their free ends, but designed, on engagement, to complete the talking circuit of the set in the manner of the usual hookswitch, which it is designed to replace. The front spring' 28 is arranged to press the key 17 upwardly is insulated from the key by a strip of insulation 30 carried by the spring. On depression of the finger key 17 the sprin s 28 and 29 are engaged to close the circuit t era through.

to the position shown in Fig. 1, and

The. key 17 can, of course, be used as a calling, key if desireth but it is desirable if the set be used as a vestibule set that; the push buttons usually associated with letter boxes in a vestibule he. used for selective signaling as this enables the same kind of Set to he used without change in various installations regardless of the particular number of stations ol the system. This in turn allows stainlardization of equipment and materially lessens the dillcrent parts necessary to he kept on hand to provide. vestibule sets of a particular number of buttons and a 001 rcspoiulingly large number of front plates arranged for different numbers of buttons depending on the number of stations to be connected with in the particular equipment.

series of binding strips 31, 32, 33, 34 and 3.3 are mounted upon a block of insulation lit; which is secured to the mounting plate 'l' in such a way as to insulate the binding strips from the plate. With all the working parts of the set thus carried on the mounting plate the set can be wired up tlieeeou ready for use. When an order is received all that is necessary is to select the proper Front and secure the plate 19 thereto l! any suitable means, as, for example by bolts 37, as shown on the drawing. 'lhis can he done whether a flush type wall set or a noirflush type wall set is desired, the only difference being, that in the first case the unit is secured to the desired flush plate it), while u. the second case the unit is secured within the desired wooden, or metal, telephone case. i

The key 17 may be temporarily removed from its bracket 18 until the plate 19 has been secured in position, whereupon the key can be inserted from the front of the plate it: and again secured in place: or, if desired, the key 17 may be omitted in the assembly of the unit and after mounting the unit in place a key 17 having a. particular finish to harmonize with the particular front plate 10. would be secured in place.

A perforated closure 38 is located at the rear of the mouthpiece 11 and positioned over an inturned' portion 39 thereof to prevent injury to the transmitter, while a layer of insulation 40 is also provided between the front plate 10 and the perforatedprotecting )late 41 of the transmitter 25 to insulate t 10 transmitter from the front plate.

The insulation 40 has an opening 42 therein in registration with the sound opening in the mouthpiece to provide for. the passage of sounds to-the transmitter.

ltiis apparent from the above description that all the. necessary parts of the set, such as a switch; contact or. binding post stri s, transmitter, receiverand horn may be irectly assembled on the mounting plate 19 with the wiring of the internal circuit f the set completed, ornot, as desired, and,

kept in this way ready to be positioned directly on any one of the number of plates or casings which might he desired to provide a particular style or finish. The necesbary parts thus form a unit ready to be secured tosuch a front plate or casing of the desired finish, according as to Whether a flush or non-flush type of Wall set is desired.

-It also provides for ready repair of dam- -member and plate together, a telephonic member, a born for said member having one end Secured thereto and the other end positioned ad acent said front member, and an extension carried by the end of the horn adacent said front member extending between sand front member and back date and clamped between them to hold said horn in place.

2. A telephone set comprising an outlet box, a front member adapted to be secured to said outlet box, a back plate removably secured to said front member, a receiver and a transmitter secured to said back plate, and means to permit the tree removal of said 'front member and said back plate from said outlet box as a unit.

A telephone set comprising an outlet thus, a. front plate adapted to be secured to said outlet box, a back plate rcniovubly secured to said front plate. telephonic apparains secured to said back plate, and means to removably secure said front plate to said outletdiox 'lor permitting the removal of said telephonic apparatus as a unit.

4-. A telephone set comprising an outlet box. a front member adapted to be removably secured to said outlet box, a back plate re movably mounted. on said front member, and a transmitter. receiver, key and binding posts securcr'l to said back plate and removable as a unit therewith upon the renio *al of said front member from said outlet box.

5. A telephone set comprising a mounting plate, a transmitter mounted on said plate, a receiver separate from said trans mitter, a mounting for said receiver secured to said plate below said transmitter, and a horn carried by said receiver positioned over and partially surrounding said transmitter and cooperating with said receiver to protest the transmitter.

(i. A telephone set comprising a front plate having, a plurulit of openings therein. :1 back plate removuhlv "!"-ll]1t0(l on said frnut member, means :o removably secure said plates together, a *ansmitter mounted on said back plate opposite one of said openings in said front plate. a receiver mounted on said back plate, and a horn carried by said receiver and extending therefrom to another of said openings in said front plate; said receiver and horn extending over and partially surrounding said tansmitter.

T. A telephone set comprising a vertical mounting plate, a transmitter mounted on said plate, a receiver mounted on said plate below said transmitter and extending horizontally relative to said plate, and a horn carried by said receiver and extendinq vertically relative to said plate positionet over and partially surrounding said transmitter and cooperating With said receiver to protect the transmitter.

telephone set comprising an outlet box, a cover plate secured to said outlet box and having a mouthpiece formed therein, a mounting: plate secured to said cover plate, a transmitter secured to said mounting plate in position to cooperate with said mouthpiece, a receiver mounted in close proximity to said transmitter and. secured to said mounting plate, and means to removably secure said cover and mounting plate to said outlet box for permitting the removal of said transmitter and receiver as a unit.

In Witness whereof, I hereunto subscribe my name this 26th day of June, A. l). 1917.

WILLIAM T. BOOTH. 

